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Coating composition and method for forming coating film

a coating composition and coating film technology, applied in the field of coating compositions, can solve the problems of unsatisfactory acid resistance and unsatisfactory scratch resistance of the coating film, and achieve the effects of excellent finish appearance, moderate curability, and excellent balance of scratch resistance and stain resistan

Inactive Publication Date: 2014-03-04
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]According to the coating composition of the present invention comprising an acrylic resin (A) containing specific monomers as constituent components, a polyisocyanate compound (B) and a non-aqueous dispersion-type acrylic resin (C), an optimum cure rate can be achieved in a curing process, enabling the formation of a coating film excellent in finished appearance such as surface smoothness etc. This is because the acrylic resin contains a secondary hydroxyl group, which has more moderate curability than a primary hydroxyl group, as a crosslinkable functional group supplied by an unsaturated monomer (a-1) represented by the above general formula (1) and a secondary hydroxyl group-containing polyoxyalkylene mono(meth)acrylate monomer (a-2).
[0015]Further, a combined use of the unsaturated monomer (a-1) and the monomer (a-2) enables the formation of a coating film that has an excellent balance of scratch resistance and stain resistance, and the additional use of a monomer (a-3) enables the formation of a coating film having excellent scratch resistance, in particular, excellent durability in scratch resistance. Furthermore, the urethane crosslinkage formed by a reaction of the acrylic resin (A) and the polyisocyanate compound (B) can provide excellent resistance to acid hydrolysis, enabling the formation of a coating film excellent in acid resistance.
[0016]In addition, since the coating composition of the present invention comprises the non-aqueous dispersion-type acrylic resin (C) as a component of a rheology control agent, the coating composition provides excellent sagging resistance as well as excellent application workability.
[0017]As described above, the effects achieved by the present invention is that a coating composition that is excellent in application workability, and that can form a cured coating film excellent in finished appearance, scratch resistance, acid resistance and stain resistance, can be obtained.

Problems solved by technology

However, the melamine crosslinkage in this coating composition easily undergoes hydrolysis by acid rain; therefore, this coating composition provides unsatisfactory acid resistance.
However, the scratch resistance of this coating film is not satisfactory.

Method used

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  • Coating composition and method for forming coating film
  • Coating composition and method for forming coating film
  • Coating composition and method for forming coating film

Examples

Experimental program
Comparison scheme
Effect test

examples

[0170]Hereunder, the present invention is explained in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the following Examples. In the following examples, parts and percentages are by mass, and the film thickness is the thickness of a cured coating film.

Production of Acrylic Resin (A)

production examples 1-9

[0171]31-part quantities of ethoxyethyl propionate were introduced into four-necked flasks, each equipped with a stirrer, a thermometer, a condenser tube, and a nitrogen gas inlet, and the resulting mixtures were heated to 155° C. under a nitrogen atmosphere. When the temperature reached 155° C., the supply of nitrogen gas was stopped, and each monomer mixture comprising a composition containing the monomers and the polymerization initiator shown in Table 1 below was added thereto dropwise over 4 hours. Subsequently, aging was performed for 2 hours under a nitrogen atmosphere at 155° C., and each of the resulting products was then cooled to 100° C., followed by dilution with 32.5 parts of butyl acetate. Thereby, acrylic resins (A-1) to (A-9), each having a solids content of 60%, were obtained. Table 1 below shows the solids mass concentration (%) and resin properties of the obtained acrylic resins (A).

[0172]In Table 1, the glass transition temperature (Tg (° C.)) was calculated usin...

production example 10

[0176]A 93-part quantity of heptane and 98 parts of the 55% polymeric dispersion stabilizer solution (Note 1) below were introduced into a four-necked flask equipped with a stirrer, a thermometer, a condenser tube, and a nitrogen gas inlet, and the resulting product was heated under reflux. The mixture of the monomers and the polymerization initiator shown below was added thereto dropwise over 3 hours, and the resulting product was aged for another 2 hours. Thereby, a non-aqueous dispersion-type acrylic resin (C-1) was obtained.

[0177]A Mixture of Monomers and a Polymerization Initiator

[0178]A mixture containing 15 parts of styrene, 40 parts of methyl methacrylate, 30 parts of acrylonitrile, 15 parts of 2-hydroxyethyl methacrylate, and 1.5 parts of t-butylperoxy-2-ethylhexanoate.

[0179]The thus-obtained non-aqueous dispersion-type acrylic resin (C-1) was a stable, milk-white, low-viscosity polymer dispersion having a mass solids concentration of 53%, a Gardner viscosity of B, and an a...

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Abstract

The present invention provides a coating composition that is excellent in application workability, and that can form a cured coating film excellent in coating film performances such as scratch resistance, acid resistance, stain resistance, finished appearance, sagging resistance, etc. Specifically, the present invention provides a coating composition comprising an acrylic resin (A), a polyisocyanate compound (B) and a specific non-aqueous dispersion-type acrylic resin (C), wherein: the acrylic resin (A) is obtainable by copolymerization of a specific secondary hydroxyl group-containing monomer (a-1), a secondary hydroxyl group-containing polyoxyalkylene mono(meth)acrylate monomer (a-2), an isobornyl (meth)acrylate monomer (a-3) and at least one other copolymerizable unsaturated monomer (a-4), the unsaturated monomer (a-1) being used in an amount (mass) greater than that of the monomer (a-2).

Description

TECHNICAL FIELD[0001]The present invention relates to a coating composition that is excellent in application workability, and that can form a coating film excellent in scratch resistance, acid resistance and stain resistance.BACKGROUND ART[0002]Coating compositions that are applied to automobile bodies or like coated objects are required to provide excellent coating film performance in terms of scratch resistance, acid resistance, stain resistance, finished appearance, etc.[0003]Hitherto, melamine crosslinking coating compositions have been widely used as coating compositions for such objects to be coated, i.e. coated objects. A melamine crosslinking coating composition contains a hydroxyl group-containing resin and a melamine resin that acts as a crosslinking agent. Since the melamine crosslinking coating composition has a high crosslinking density during heat curing, the coating film formed therefrom has excellent coating film performance such as scratch resistance, finished appea...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08K5/00C08L31/04C08L55/00C08L45/00C08L33/10C08L33/08
CPCC09D133/08C08F2220/281C08G18/6254C08L33/066C08L33/08C09D133/066C09D175/04C08G18/792C08F220/281C08F220/20C08F220/1811C08L2666/04C08F212/08C08F230/085C08F220/06C08F220/14C08F220/1812C08F220/18C08F220/287C08F230/08C09D133/06
Inventor CHIGA, KOKITONOMURA, HIRONORINAKAO, YASUSHI
Owner KANSAI PAINT CO LTD
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